Drivers for Pockels Cells

Transcription

1 4 Laser electronics PCD-UHR series OEM Cavity Dumper Drivers features Fast HV rise/fall time <4 8 ns HV pulse amplitude up to.6 kv Fig.. Control timing charts for two-pulses controlled drivers Fig. 4. Control timing charts for single pulse controlled drivers Fig. 1. OEM version of PCD-UHR series Pockels cell driver Pulse repetition rate up to.5 MHz Output pulse jitter <50 ps if trigger pulse rise time < 0.5 ns PCD-UHR series Pockels cell drivers are designed for wide range of applications and operating modes. Repetition rate can be up to 500 khz for standard range of drivers, up to 1 MHz enhanced and up to.5 MHz high rate. Standard range of possible pulse durations is from 100 ns to 5 μs. It can be extended to infinity using pulse regeneration technique. Next pages of the catalog presents tables of different versions of the drivers built as variations of voltage, repetition rate and rise/fall time. That three main parameters are mutually dependent. Higher voltage means longer rise/fall time, and higher repetition rate is limited by voltage. However, all the drivers can work at 1 MHz and even higher repetition rate in burst mode not exceeding specified average HV power. Connection diagram can be PUSH- PULL configuration using stand-alone driver, as well as FULL BRIDGE using two drivers for one Pockels cell. FULL BRIDGE configuration gives such advantages as repetition rate doubling to reach up to 7 MHz rate, pulse duration shortening down to zero or voltage doubling on pockels cell. Contact EKSPLA for more information and suggestions for Pockels cell driving solutions you need. Fig. 2. Encased version of PCD-UHR series Pockels cell driver Most of PCD-UHR series units are available in two versions: open frame which is ideal for OEM manufacturers incorporating drivers in their own systems and encased in aluminum housings. Encasing of Pockels cell driver in aluminum housing solves two problems: shields both humans and electronics from high voltage impact from operating Pockels cell driver, and protects driver itself from potentially harmful external contact ensuring safe operation and driver longevity. The housed option is especially handy for researchers and custom product manufacturers who use these drivers during their own systems build-up. PCD-UHRS modification has possibility to shorten output pulse duration down to 15 ns. Following they can be used for single pulse selection in pulse picker applications for high repetition rate lasers. PCD-UHR series drivers has two modifications by control inputs. PCD-UHR1 drivers are controlled by one triggering pulse while rising edge turns on high voltage to Pockels cell and falling edge turns off see Fig. 4. for reference. PCD-UHR2 drivers are controlled by two triggering pulses that are applied to separate inputs of the driver, see Fig..

2 5 Pulse regeneration technique Selection chart PCH-UHR series driver s selection chart Gives possibility to operate push-pull drivers very long output pulse, and full bridge drivers get very low repetition rate. Pulse regeneration does not work with bipolar and short-pulse driver. Trigger 1 Trigger 2 PC τ₁ 5 µs 120 ns τ₂ 5 µs Fig 5. Principle and requirements for long output pulse forming control way using pulse regeneration. Left diagram is related to PCD-UHR series, right for 2PCD-UHR series (Full-Bridge) drivers. Below chart presents summary of full line of PCD-UHR series drivers. This chart helps to choose optimal driver for your application. Horizontal axis Trigger 1 Trigger 2 Trigger Trigger 4 τ₁ 5 µs 120 ns τ₂ 5 µs 120 ns τ₃ 5 µs means repetition rate, vertical voltage. Lower voltage and lower repetition rate means lower price. khz kv PCD-UHR PCD-UHR PCD-UHRS C 1.6 2PCD-UHR PCD-UHR C 1.8 PCD-UHR C 2.4 PCD-UHR C C C C C 2.9 Regural drivers C Birolar drivers C Short-pulse drivers 50-4-C C 4.6 Full-bridge drivers C 5.2 PC1 pin PC2 pin PC voltage Ovens for Nonlinear Crystals Pump Chambers

3 6 General specifications table for PCD-UHR series drivers ¹) Driver model PCD-UHR series PCD-UHRS series Maximal HV rated voltage (for testing only) Maximal HV operating voltage.8 kv <90 % from rated voltage HV pulse rise time < 4 8 ns (Fig. 7) HV pulse fall time < 4 8 ns (Fig. 8) HV pulse duration for single driver ns ns Max HV pulse duration for full-bridge configuration ns N/A Maximal HV pulse repetition rate.5 MHz 600 khz External triggering pulse duration requirement >100 ns >10 ns External triggering pulse amplitude requirement.5 5 V (50 Ω load) External triggering pulse rise & fall time < 20 ns < 5 ns Maximal length of leads to Pockels cell Control diagram options: 10 cm single triggering pulse control Fig. 4 two trigger pulses control Fig. HV pulse delay, typical 45 ns 0 ns External powering requirements: high voltage supply depends on modification 24+¹ ₁₀ V, <150 ma low voltage DC supply 24±1 V, <150 ma 12±0.5 V, <150 ma on request ¹) Specifications are given for Pockels cell with capacity <6 pf. Not all combinations of parameters can be possible at the same time. Specifications are subject to changes without advance notice. Driver needs to be mounted on the heatsink (excluding water cooled versions). Heat sink temperature needs to be lower than 5 C (95 F) in all regimes of operation. Fig. 6. Typical output pulse shape Fig. 7. Typical rising front of output pulse in detail Fig. 8. Typical falling front of output pulse in detail Ordering / Part number information Please indicate following points by inquiry: Voltage Repetition rate Pulse duration (range) Capacitance of Pockels cell 24 V / 12 V option OEM / encased none single driver 2 full-bridge driver 2PCD-UHR C none OEM version C encased version UHR1 controlled by 1 sync pulse Working voltage, kv UHR2 controlled by 2 sync pulses UHRS short pulse driver Max repetition rate, khz

4 7 OEM Version Configuration examples of OEM version of PCD-UHR series drivers PCD-UHR PCD-UHR PCD-UHR PCD-UHR PCD-UHR PCD-UHR Fig. 9. OEM version of PCD-UHR series driver with general purpose pad Fig. 11. Outline drawing of PCD-UHR series driver with general purpose pad PCD-UHR PCD-UHR Fig. 10. OEM version of PCD-UHR series driver with conductive pad. Suitable for repetition rate up to 50 khz 6 Ø.4 45 PCD-UHR PCD-UHR Maximal HV rated voltage.8 kv 1.6 kv.7 kv 2.6 kv 2.7 kv 2 kv PCD-UHR PCD-UHR Maximal HV operating voltage.6 kv 1.5 kv.6 kv 2.5 kv 2.6 kv 1.8 kv Maximal HV repetition rate 50 khz 400 khz 250 khz 250 khz 500 khz 1000 khz Pulse duration * ns HV pulse rise time, typical <7 ns <5.5 ns <7 ns <6 ns <6.5 ns <6 ns HV pulse fall time, typical <7 ns <5.5 ns <7 ns <6 ns <6.5 ns <6 ns positive HV power consumption <20 W <20 W <75 W <40 W <90 W <80 W 12V/24V power consumption 1 W 5.5 W 4 W 4.5 W 6 W 9 W Dimensions see Fig. 12 see Fig. 11 Cooling conductive conductive or water Driver needs to be mounted on the heatsink (excluding water cooled versions). HV output voltage to Pockels cell is equal to HV power supply voltage. * Pulse duration of PCD-UHR2 series drivers can be extended using pulse regeneration Ø4 57 Ø Fig. 12. Outline drawing of PCD-UHR series drivers with conductive pad Ovens for Nonlinear Crystals Pump Chambers

5 8 Specific features of PCD-UHRS drivers OEM Short-pulse Version Short circuit protection at driver output Driver pad overheat sensor stops operation when overheated overheat optocoupled output signal open circuit means error state Switchable single pulse and two pulses control operation modes led for error indication (overheat and short circuit) Configuration examples of OEM version of PCD-UHRs series Short-pulse drivers PCD-UHRS PCD-UHRS PCD-UHRS PCD-UHRS PCD-UHRS PCD-UHRS Maximal HV rated voltage.8 kv 1.6 kv.7 kv 2.6 kv 2.6 kv 2 kv Range of HV operating voltage kv kv kv kv kv kv Maximal HV repetition rate 50 khz 400 khz 250 khz 250 khz 600 khz 600 khz Pulse duration ns ns ns ns ns ns HV pulse rise time, typical <7 ns <5.5 ns <7 ns <6 ns <6.5 ns <6 ns HV pulse fall time, typical <7 ns <5.5 ns <7 ns <6 ns <6.5 ns <6 ns positive HV power consumption <20 W <20 W <75 W <40 W <100 W <5 W 12 V / 24 V power consumption 1 W 5.5 W 4 W 4.5 W 7 W 7 W Dimensions see Fig. 14 see Fig. 15 Cooling conductive conductive or water Driver needs to be mounted on the heatsink (excluding water cooled versions). HV output voltage to Pockels cell is equal to HV power supply voltage. Ø Fig. 1. OEM version of PCD-UHRS series driver with general purpose pad Fig. 14. Outline drawing of PCD-UHRS series drivers with conductive pad Fig. 15. Outline drawing of PCD-UHRS series driver with general purpose pad 88 4 Ø4 57 Ø 4.

6 9 ENcased Short-pulse version Configuration examples of Encased version of PCD-UHRs series Short-pulse drivers Maximal HV rated voltage.7 kv 2.6 kv 2.6 kv PCD-UHRS C Range of HV operating voltage kv kv kv Maximal HV repetition rate 250 khz 250 khz 600 khz Pulse duration ns ns ns HV pulse rise time, typical <7 ns <6 ns <6.5 ns HV pulse fall time, typical <7 ns <6 ns <6.5 ns 7 66 Ø PCD-UHRS C positive HV power consumption <75 W <40 W <100 W 12V/24V power consumption 4 W 4.5 W 7 W Dimensions see Fig. 17 Cooling HV output voltage to Pockels cell is equal to HV power supply voltage. Fig. 16. Encased version of driver PCD-UHRS water PCD-UHRS PCD-UHRS C Fig. 17. Outline drawing of encased version of driver PCD-UHRS 68 Ovens for Nonlinear Crystals Pump Chambers

7 10 Encased version (unipolar drivers) Configuration Examples of encased version of PCD-UHR series drivers PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C Maximal HV rated voltage.7 kv 2.6 kv 2.7 kv 2 kv Maximal HV operating voltage.6 kv 2.5 kv 2.6 kv 1.8 kv Maximal HV repetition rate 250 khz 250 khz 500 khz 1000 khz Pulse duration * Ø ns HV pulse rise time, typical <7 ns <6 ns <6.5 ns <6 ns HV pulse fall time, typical <7 ns <6 ns <6.5 ns <6 ns positive HV power consumption <75 W <40 W <90 W <80 W 12V/24V power consumption 4 W 4.5 W 6 W 9 W Dimensions see Fig. 19 Cooling HV output voltage to Pockels cell is equal to HV power supply voltage. * Pulse duration of PCD-UHR2 series drivers can be extended using pulse regeneration. water Fig. 18. Encased version of driver PCD-UHR models PCD-UHRx-200-xx, PCD-UHRx-250-xx, PCD-UHRx-500-xx, PCD-UHRx Fig. 19. Outline drawing of encased version of driver PCD-UHR models PCD-UHRx-200-xx, PCD-UHRx-250-xx, PCD-UHRx-500-xx, PCD-UHRx

8 11 Encased version (bipolar drivers) Configuration Examples of encased version of PCD-UHR series Bipolar drivers PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C PCD-UHR C Maximal HV rated voltage.0 kv 4.2 kv 4.8 kv 5. kv Maximal HV operating voltage 2.9 kv 4.0 kv 4.6 kv 5.2 kv Maximal HV repetition rate 1000 khz 50 khz 00 khz 250 khz Pulse duration * ns HV pulse rise time, typical <7.5 ns <7.5 ns <8.0 ns <8.5 ns HV pulse fall time, typical <7.5 ns <7.5 ns <8.0 ns <8.5 ns bipolar HV power consumption ** <120 W <100 W <100 W <100 W 12 V / 24 V power consumption 9 W Dimensions see Fig. 21 Cooling water Driver needs to be mounted on the heatsink (excluding water cooled versions). HV output voltage to Pockels cell is equal to HV power supply voltage i.e. sum of positive and negative HV values. Fig. 20. Encased version of driver PCD-UHR models PCD-UHRx-1000-XX, PCD-UHRx-50-XX, PCD-UHRx-00-XX, PCD-UHRx-250-XX. Water cooled version Ø Ø * Pulse duration of PCD-UHR2 series drivers can be extended using pulse regeneration. ** Bipolar HV power supply HV2 60Wm is specifically designed for these drivers. Fig. 21. Outline drawing of encased versions of driver PCD-UHR models PCD-UHRx-1000-XX, PCD-UHRx-50-XX, PCD-UHRx-00-XX, PCD-UHRx-250-XX Ovens for Nonlinear Crystals Pump Chambers

9 12 Full-bridge version Configuration examples of FULL-BRIDGE COnfiguration drivers P/N of FULL-BRIDGE driver Base driver 2PCD-UHR C 2PCD-UHR C PCD-UHR PCD-UHR PCD-UHR C 2PCD-UHR C PCD-UHR PCD-UHR Maximal HV operating voltage 2.4 kv 1.6 kv Maximal HV repetition rate * 1000 khz 2000 khz HV pulse duration range ns HV pulse rise time <6.5 ns <6 ns HV pulse fall time <6.5 ns <6 ns Maximal capacitance of Pockel s cell <6 pf HV power consumption <160 W ** Case see Fig. 25 Cooling HV output voltage pulse to Pockels cell appears as diference of pulses OUT1 and OUT2 and is lower as HV power supply voltage. Contact Ekspla for technical details based on your request. water * Full-Bridge drivers are generally designed for operation at high repetition rate. However, low repetition rate pulsing can be achieved using pulse regeneration technique. ** Two HV power supplies HV80Wm are suggested. PH1 PH2 PCD-UHR OUT 1 Pockels Cell PH PCD-UHR OUT 2 PH4 Fig. 22. Diagram of Pockels cell full-bridge connection to driver Ø 4. Fig. 2. External view of full-bridge driver PH1 PH2 PH PH4 OUT1 OUT2 PC voltage Fig. 24. Principle of 4-phase control of FULL-BRIDGE driver configuration Fig. 25. Outline drawing of case for full-bridge drivers 98